Used to spend thousands on receiver/power amp/speakers for 5.1 but after gradually upgrading to better and better stuff over a period of 10-12 years, last year decided to pack it all in and swap my XPA-5/MRX-300/XTZ99.xx speakers for, wait for it...
Sonos Playbar/Play:1 surrounds/Sonos sub.
It's 95% as good as anything the last stuff could pump out.
No messing around, sounds brilliant. Cost a fair bit still but is worth every penny.
Note: Playbar on it's own sounds awful, Play 1s on their own sound awful. Together, it's something quite different.
Good thing with this also is it's suitable for office/bedroom/living room. (I have 3 times this setup, one in each).
Would never go back to a proper floor standers/receiver/amp - EVER - unless I was spending maybe £20,000+ and having it installed by a pro etc. Can't envision that though as better things to spend that amount on in terms of priorities.